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7-zip (64-bit Version) | Pcworld

7-Zip 9.28b - Compression Performance: 7-Zip, MagicRAR, WinRAR, WinZip

Free, open-source utility 7-Zip supports ZIP, but also the much-improved 7z compression format. In fact, 7-Zip is the official reference implementation for the 7z format, and since it is open source, the format specification is distributed right within the source code. To test it, I used a folder with 65MB of easily-compressed documents such as DOC, XLS, and BMP files; it also contained a few small ZIP files for good measure. Zipped using Windows Explorer, the folder compressed to 8,881KB. 7-Zip compressed the same exact folder down to 6,036KB, shaving almost 3MB off the archive. Thats a difference of more than 25%--phenomenal, really, when you consider ZIPs market dominance. Speaking of market dominance, thats another key difference between the 7z and ZIP formats. Windows Explorer has been handling ZIP files like folders for years, and most people recognize them instantly and work with them all the time. But send someone a .7Z file, and they may not know what to do with it--in fact, they may not even realize its a compressed file.

Original article here: http://www.pcworld.com/article/232451/7zip_64bit_version.html

7-Zip fully supports the following seven compression formats: 7z, bzip2, GZIP, TAR, WIM, XZ, and ZIP. Additionally, 7-Zip can extract an additional 24 formats: ARJ, CAB, CHM, cpio, cramfs, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR, and Z. According to its webpage, 7-Zips compression performance for ZIP and GZIP formats is between 2 and 10 percent superior to that of its competition, and our benchmarks support this claim. The app's excellent support for its own 7z compression and archiving format is another strong point. 7z is based on an open architecture with optional 256-bit AES encryption. This format achieved the highest compression rates in our benchmarks. 7-Zip defaults to the Lempel-Ziv-Markov Algorithm (LZMA) for compression with 7z, but it can also be configured to use LZMA2, PPMd, and bzip2. Moreover, it supports WinZip AES encryption, making it possible to create ZIP archives with 256-bit AES encryption. 7-Zip integrates into the Windows Explorer context menus, and it displays archive files as normal folders.

Original article here: http://www.tomshardware.com/reviews/winrar-winzip-7-zip-magicrar,3436-2.html

Unix tip: 7-Zip to the rescue | ITworld

It also offers AES-256 encryption for 7z and ZIP formats should you need it. 7-Zip works in Windows 98, ME, NT, 200, XP (I use XP Professional) and Vista. It was a 2007 winner in the SourceForge.net Community Choice Awards for both Best Project and Best Technical Design. I found it to be both quick and reliable. It also has localizations for 74 languages. 7-Zip also works on the command line. If you like working in a DOS Command Prompt, you can get a list of the tool's options by simply typing its name. That output is shown below. C:\Program Files\7-Zip>7z 7-Zip 4.57 Copyright (c) 1999-2007 Igor Pavlov 2007-12-06 Usage: 7z [...] [...] [] a: Add files to archive b: Benchmark d: Delete files from archive e: Extract files from archive (without using directory names) l: List contents of archive t: Test integrity of archive u: Update files to archive x: eXtract files with full paths -ai[r[-|0]]{@listfile|!wildcard}: Include archives -ax[r[-|0]]{@listfile|!wildcard}: eXclude archives -bd: Disable percentage indicator -i[r[-|0]]{@listfile|!wildcard}: Include filenames -m{Parameters}: set compression twitter Method -o{Directory}: set Output directory -p{Password}: set Password -r[-|0]: Recurse subdirectories -scs{UTF-8 | WIN | DOS}: set charset for list files -sfx[{name}]: Create SFX archive -si[{name}]: read data from stdin -slt: show technical information for l (List) command -so: write data to stdout -ssc[-]: set sensitive case mode -ssw: compress shared files -t{Type}: Set type of archive -v{Size}[b|k|m|g]: Create volumes -u[-][p#][q#][r#][x#][y#][z#][!newArchiveName]: Update options -w[{path}]: assign Work directory.

Original article here: http://www.itworld.com/personal-tech/59945/7-zip-rescue

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